﻿/*!
** Unobtrusive Ajax support library for jQuery
** Copyright (C) Microsoft Corporation. All rights reserved.
*/

/*jslint white: true, browser: true, onevar: true, undef: true, nomen: true, eqeqeq: true, plusplus: true, bitwise: true, regexp: true, newcap: true, immed: true, strict: false */
/*global window: false, jQuery: false */

(function ($) {
	var data_click = "unobtrusiveAjaxClick",
        data_validation = "unobtrusiveValidation";

	function getFunction(code, argNames) {
		var fn = window, parts = (code || "").split(".");
		while (fn && parts.length) {
			fn = fn[parts.shift()];
		}
		if (typeof (fn) === "function") {
			return fn;
		}
		argNames.push(code);
		return Function.constructor.apply(null, argNames);
	}

	function isMethodProxySafe(method) {
		return method === "GET" || method === "POST";
	}

	function asyncOnBeforeSend(xhr, method) {
		if (!isMethodProxySafe(method)) {
			xhr.setRequestHeader("X-HTTP-Method-Override", method);
		}
	}

	function asyncOnSuccess(element, data, contentType) {
		var mode;

		if (contentType.indexOf("application/x-javascript") !== -1) {  // jQuery already executes JavaScript for us
			return;
		}

		mode = (element.getAttribute("data-ajax-mode") || "").toUpperCase();
		$(element.getAttribute("data-ajax-update")).each(function (i, update) {
			var top;
			$(update).html("");
			switch (mode) {
				case "BEFORE":
					top = update.firstChild;
					$("<div />").html(data).contents().each(function () {
						update.insertBefore(this, top);
					});
					break;
				case "AFTER":
					$("<div />").html(data).contents().each(function () {
						update.appendChild(this);
					});
					break;
				default:
					$(update).html($(data));
					break;
			}
		});
	}

	function asyncRequest(element, options) {
		var confirm, loading, method, duration;

		confirm = element.getAttribute("data-ajax-confirm");
		if (confirm && !window.confirm(confirm)) {
			return;
		}

		loading = $(element.getAttribute("data-ajax-loading"));
		duration = element.getAttribute("data-ajax-loading-duration") || 0;

		$.extend(options, {
			type: element.getAttribute("data-ajax-method") || undefined,
			url: element.getAttribute("data-ajax-url") || undefined,
			beforeSend: function (xhr) {
				var result;
				asyncOnBeforeSend(xhr, method);
				result = getFunction(element.getAttribute("data-ajax-begin"), ["xhr"]).apply(this, arguments);
				if (result !== false) {
					loading.show(duration);
				}
				return result;
			},
			complete: function () {
				loading.hide(duration);
				getFunction(element.getAttribute("data-ajax-complete"), ["xhr", "status"]).apply(this, arguments);
			},
			success: function (data, status, xhr) {
				asyncOnSuccess(element, data, xhr.getResponseHeader("Content-Type") || "text/html");
				getFunction(element.getAttribute("data-ajax-success"), ["data", "status", "xhr"]).apply(this, arguments);
			},
			error: getFunction(element.getAttribute("data-ajax-failure"), ["xhr", "status", "error"])
		});

		options.data.push({ name: "X-Requested-With", value: "XMLHttpRequest" });

		method = options.type.toUpperCase();
		if (!isMethodProxySafe(method)) {
			options.type = "POST";
			options.data.push({ name: "X-HTTP-Method-Override", value: method });
		}

		$.ajax(options);
	}

	function validate(form) {
		var validationInfo = $(form).data(data_validation);
		return !validationInfo || !validationInfo.validate || validationInfo.validate();
	}

	$("a[data-ajax=true]").live("click", function (evt) {
		evt.preventDefault();
		asyncRequest(this, {
			url: this.href,
			type: "GET",
			data: []
		});
	});

	$("form[data-ajax=true] input[type=image]").live("click", function (evt) {
		var name = evt.target.name,
            $target = $(evt.target),
            form = $target.parents("form")[0],
            offset = $target.offset();

		$(form).data(data_click, [
            { name: name + ".x", value: Math.round(evt.pageX - offset.left) },
            { name: name + ".y", value: Math.round(evt.pageY - offset.top) }
		]);

		setTimeout(function () {
			$(form).removeData(data_click);
		}, 0);
	});

	$("form[data-ajax=true] :submit").live("click", function (evt) {
		var name = evt.target.name,
            form = $(evt.target).parents("form")[0];

		$(form).data(data_click, name ? [{ name: name, value: evt.target.value }] : []);

		setTimeout(function () {
			$(form).removeData(data_click);
		}, 0);
	});

	$("form[data-ajax=true]").live("submit", function (evt) {
		var clickInfo = $(this).data(data_click) || [];
		evt.preventDefault();
		if (!validate(this)) {
			return;
		}
		asyncRequest(this, {
			url: this.action,
			type: this.method || "GET",
			data: clickInfo.concat($(this).serializeArray())
		});
	});
}(jQuery));